The invention relates to a wind-fire coordinated automatic voltage control method, and belongs to the technical field of automatic voltage control of power systems. According to the method, coordinated calculation is carried out on calculation models of a wind power collecting region and a thermal power region in secondary voltage control and a secondary voltage control model (CSVC) is separately corrected under different conditions to solve wind power control or power plant control in a partition, so that the target of wind-fire coordinated voltage control on a wind power farm region and the adjacent thermal power region is achieved. By the method, multi-wind farm chain talkaround caused by a voltage drop in the wind power collecting region can be avoided; and the voltage stability and the voltage quality of a power network are improved.